<?php 

	$num = 90;

	$num = 345.454;

	$num = true;

	$num ="9\"sdfsdf\"0";


	$str = <<<fff
	sdfsdfsdfa;sfsdfasf
	sdfsdfsdfaf
	sdfsdfsdf
fff;
	

	$a = 90;

	$str = "这个是{$a}b";

	echo $str;

	var_dump(is_string($str));














 ?>